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<b>let </b><font color="Maroon">i</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/><b>let </b><font color="Maroon">r1</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K1">REAL</a> ;<br/><b>let </b><font color="Maroon">r2</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K1">REAL</a> ;<br/>





<b>thus </b><span class="p1">(<span class="default"><font color="Maroon">i</font> <a href="finseqop.html#K4">|-&gt;</a> <font color="Maroon">r1</font></span>)</span> <a href="rvsum_1.html#K8" target="_self">-</a> <span class="p1">(<span class="default"><font color="Maroon">i</font> <a href="finseqop.html#K4">|-&gt;</a> <font color="Maroon">r2</font></span>)</span> = 
<font color="Maroon">i</font> <a href="finseqop.html#K4">|-&gt;</a> <span class="p1">(<span class="default"><a href="binop_2.html#K34">diffreal</a>  <a href="binop_1.html#K2">.</a> <font color="Maroon">r1</font>,<font color="Maroon">r2</font></span>)</span>
<b>by </b><i><a class="ref" href="finseqop.html#T18">FINSEQOP:18</a></i>
<br/>.= 
<font color="Maroon">i</font> <a href="finseqop.html#K4">|-&gt;</a> <span class="p1">(<span class="default"><font color="Maroon">r1</font> <a href="binop_2.html#K10">-</a> <font color="Maroon">r2</font></span>)</span>
<b>by </b><i/>
;<br/>


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